change windows size

Web Min <[email protected]>
Newsgroups gmane.comp.mobile.kannel.user
Message-ID <CAB=bB0NZMU+9AJF=R-S4z-7oe6gHh5XpZsq86qERpqj7y8p6CA@mail.gmail.com> 
Hello,

I just received the following message from the gateway, any help would be
appreciated.

Please notice that today we received bad request from your side and after
investigation found that problem from your side because of sending messages
using ASYNC mode ,

please make sure that window size = 1 .

Which parameter should I Add or change to effect the size of the window?

Regards
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